Week 33

Your Baby at Week 33

Your baby is the size of a pineapple at 33 weeks. The pupils can now constrict and dilate in response to light, and your baby is starting to distinguish day from night.

Key milestone: The baby's pupils constrict and dilate in response to light. The immune system continues developing. The baby can distinguish between day and night.

Your Body at Week 33

In the third trimester, your growing uterus presses against your diaphragm, stomach, and bladder. Shortness of breath, heartburn, and frequent urination are common. Your body is producing relaxin, a hormone that loosens joints and ligaments to prepare for birth.

Your baby at week 33 is the size of a Pineapple, measuring about 12.0 in (30.5 cm) and weighing roughly 3.6 lb (1.65 kg). Every kick, roll, and hiccup is a sign that your baby is growing strong. Soon you'll hold them in your arms.

Your Baby's Development This Week

Your baby is the size of a pineapple at 33 weeks. The pupils can now constrict and dilate in response to light, and your baby is starting to distinguish day from night. The key milestone this week is that the baby's pupils constrict and dilate in response to light. the immune system continues developing. the baby can distinguish between day and night.

The third trimester is about preparation — your baby is practicing breathing, sucking, and swallowing for life outside the womb. Each week of this stage significantly improves their chances of a healthy start. The countdown to meeting your baby has begun.